When does a UNIX directory change its timestamp

Question

I used \"touch\" on a file, updating the file\'s timestamp but the parent directory\'s timestamp did not change. However, (as expected) when I created a new file within the

Answer 1

A directory's timestamp is changed when the Directory itself is changed. The directory contains, among other things, a list of the inodes of the files in the directory so when you change the content of the directory by adding or removing files then the Directories timestamp will be updated.